问题: 2個句子改錯（每個句子中，有一處括號中是錯誤的，請改正）
1.(It) must have been (them) who (did not turn off) the lights (before) leaving the room.
2. Only (then)( they were) ordered to intensify their patrols (to protect) our (air space).
解答:
1.应该去掉them ,这是一个强调句.
2.当only 放在句首时,句子要部分倒装,所以,they were 应该到装成 were they .
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